CVE-2026-74740
CVE CVE-2026-74740EUVD EUVD-2026-66570Published 2026-08-26T14:36:52.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain tcf_action_exec() handles TC_ACT_GOTO_CHAIN by first checking rcu_access_pointer(a->goto_chain) and then calling tcf_action_goto_chain_exec(), which does a second, independent rcu_dereference_bh(a->goto_chain) read and immediately dereferences chain->filter_chain. A concurrent tcf_action_set_ctrlact() (e.g. the gact replace path) can clear a->goto_chain between the two reads, so the second read returns NULL and tcf_action_goto_chain_exec() dereferences NULL. Fix the race by doing a single rcu_dereference_bh() read of a->goto_chain in tcf_action_exec(), checking it once for NULL, and passing the resulting chain pointer into tcf_action_goto_chain_exec(). This turns the split check/use into a single check/use on one value.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5 <91d55fd1fdb85c8371ca8793c788ea7d5192383a; patch: 7.1.10; patch: 0; patch: 6.6.153; 5.1; ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5 <f60b396ee174206fe08ebf997d16cd3801b77b22; ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5 <abceabc4408fca6a9dd52611f5d197dec9390d63; patch: 6.12.105; ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5 <6b70886ebc428eed43a069c8944a931b5fb3f4e4; patch: 6.18.46; ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5 <1ec48b6715c29b20105e3485206602cff6c51ae5; patch: 7.2
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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